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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC17C44-08/P датащи(PDF) 131 Page - Microchip Technology |
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PIC17C44-08/P датащи(HTML) 131 Page - Microchip Technology |
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131 / 240 page  © 1996 Microchip Technology Inc. DS30412C-page 131 PIC17C4X RETFIE Return from Interrupt Syntax: [ label ] RETFIE Operands: None Operation: TOS → (PC); 0 → GLINTD; PCLATH is unchanged. Status Affected: GLINTD Encoding: 0000 0000 0000 0101 Description: Return from Interrupt. Stack is POP’ed and Top of Stack (TOS) is loaded in the PC. Interrupts are enabled by clearing the GLINTD bit. GLINTD is the global interrupt disable bit (CPUSTA<4>). Words: 1 Cycles: 2 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read register T0STA Execute NOP Forced NOP NOP Execute NOP Example: RETFIE After Interrupt PC = TOS GLINTD = 0 RETLW Return Literal to WREG Syntax: [ label ] RETLW k Operands: 0 ≤ k ≤ 255 Operation: k → (WREG); TOS → (PC); PCLATH is unchanged Status Affected: None Encoding: 1011 0110 kkkk kkkk Description: WREG is loaded with the eight bit literal 'k'. The program counter is loaded from the top of the stack (the return address). The high address latch (PCLATH) remains unchanged. Words: 1 Cycles: 2 Q Cycle Activity: Q1 Q2 Q3 Q4 Decode Read literal 'k' Execute Write to WREG Forced NOP NOP Execute NOP Example: CALL TABLE ; WREG contains table ; offset value ; WREG now has ; table value : TABLE ADDWF PC ; WREG = offset RETLW k0 ; Begin table RETLW k1 ; : : RETLW kn ; End of table Before Instruction WREG = 0x07 After Instruction WREG = value of k7 |
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